Scientific authentication of recordings in forensic evaluations depends on having a reliable collection of parameters that can be used to determine originality, alterations, editing, and rerecording. DC offset, which is intrinsic to all electronics, is a possible candidate for such evaluations. Nine small digital audio recorders and five audio formats were measured to determine if they displayed sufficient salient characteristics to make meaningful comparisons between submitted audio files and exemplar recordings. The wide variation and inconsistency of DC offset in relation to the observed standard deviation precluded the use of this parameter.

Authors: Koenig, Bruce E.; Lacey, Douglas S.; Grigoras, Catalin; Price, Suzana Galic; Smith, Jeff M.
Affiliations: BEK TEK LLC, Clifton, Virginia, USA; National Center for Media Forensics, University of Colorado Denver, Denver, Colorado, USA(See document for exact affiliation information.)
JAES Volume 61 Issue 6 pp. 439-448; June 2013
Publication Date: July 8, 2013

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